javascript - How can i keep the color the same in highcharts -

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i using highcharts first time. looks cool , doing want. use piechart , refresh data every second. working color of pieces changing every second. how can keep same color?

this code

var chart; $(document).ready(function() { chart = new highcharts.chart({     chart: {         renderto: 'container',         plotbackgroundcolor: null,         animation: false,         plotborderwidth: null,         plotshadow: false,         events: {             load: function() {                  // set updating of chart each second                 var series = this.series[0];                 setinterval(function() {                     $.getjson("opencont.php", function (data) {                         $.each(data.vragen, function (index, value) {                         series.addpoint([value.short, value.antwoorden], true, true);                         })                         })                 }, 1000);             }             }     },     title: {         text: ''     },     tooltip: {         formatter: function() {             return '<b>'+ this.point.name +'</b>: '+ this.percentage +' %';         }     },     plotoptions: {         pie: {             allowpointselect: true,             cursor: 'pointer',             datalabels: {                 enabled: true,                 color: '#000000',                 connectorcolor: '#000000',                 formatter: function() {                     return '<b>'+ this.point.name +'</b>: '+ this.percentage +' %';                 }             }         }     },       series: [{         type: 'pie',         name: 'browser share',         data: [         ['a', 0], ['b', 0], ['c', 0]         ]     }] }); });

do want add new points pie chart, or want replace existing points new values?

if it's later, might want @ series setdata method. example @ http://jsfiddle.net/ebuts/22/


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